Ferroelectric Capped Magnetization in Multiferroic PZT/LSMO Tunnel Junctions

Self-poled ultra-thin ferroelectric PbZr0.52Ti0.48O3 (PZT) (5 and 7 nm) films have been grown by pulsed laser deposition technique on ferromagnetic La0.67Sr0.33MnO3 (LSMO) (30 nm) to check the effect of polar capping on magnetization for ferroelectric tunnel junction (FTJ) devices. PZT/LSMO heterostructures with thick polar PZT (7 nm) capping show nearly 100% enhancement in magnetization compared with thin polar PZT (5 nm) films, probably due to excess hole transfer from the ferroelectric to the ferromagnetic layers. Core-level X-ray photoelectron spectroscopy studies revealed the presence of larger Mn 3s exchange splitting and higher Mn3+/Mn4+ ion ratio in the LMSO with 7 nm polar capping.Comment: 17 pages, 5 figure

Comparison of Grain Structure, Electrical and Magnetic Properties of BaTiO3 and Ni0.5Zn0.5Fe2O4 Ceramics Sintered Using Microwave and Conventional Techniques

BaTiO3 (BT) and Ni0.5Zn0.5Fe2O4 (NZF) ceramic disc specimens were prepared using commercial grade powders sintering by conventional (CV) and microwave (MW) sintering techniques. In both the sintering techniques the set sintering temperatures were in the range of 850 °C to 1000 °C and time from 0.5 to 2 h. Structure, microstructure, dielectric, ferroelectric and magnetic properties have been compared for the as sintered BT and NZF ceramic specimens. Comparatively large grain size and higher density observed for the samples sintered at same temperature and shorter holding time using microwave. Magnetic properties of the NZF samples sintered using MW at a temperature of 950 °C show a higher saturation magnetization (Ms) value of 88 emu/g

Comparison of Grain Structure, Electrical and Magnetic Properties of BaTiO3 and Ni0.5Zn0.5Fe2O4 Ceramics Sintered Using Microwave and Conventional Techniques

BaTiO3 (BT) and Ni0.5Zn0.5Fe2O4 (NZF) ceramic disc specimens were prepared using commercial grade powders sintering by conventional (CV) and microwave (MW) sintering techniques. In both the sintering techniques the set sintering temperatures were in the range of 850 °C to 1000 °C and time from 0.5 to 2 h. Structure, microstructure, dielectric, ferroelectric and magnetic properties have been compared for the as sintered BT and NZF ceramic specimens. Comparatively large grain size and higher density observed for the samples sintered at same temperature and shorter holding time using microwave. Magnetic properties of the NZF samples sintered using MW at a temperature of 950 °C show a higher saturation magnetization (Ms) value of 88 emu/g

Ferroelectric capped magnetization in multiferroic PZT/LSMO tunnel junctions (vol 106, 132901, 2015)

This article was originally published online on 31 March 2015 with an incorrect author’s address. The address is correct as it appears above. All online versions were corrected on 3 April 2015 and the address was correct as it appeared in the printed version of the journal

General One-Step Self-Assembly of Isostructural Intermetallic Co^II₃Ln^III Cubane Aggregates

A new family of Co/rare-earth intermetallic cubane aggregates [Co₃Ln­(hmp)₄(OAc)₅H₂O] (Ln = Dy, Ho, Er, Tm, Yb, Y) have been synthesized by self-assembly. Single-crystal X-ray diffraction analysis revealed that they are remarkably isostructural in showing a common [Co₃Ln] core. Magnetic studies showed that the Dy, Er, Tm, Yb, and Y complexes are ferromagnetic. The Dy complex exhibits the largest magnetocaloric effect (−Δ<i>S</i>_m = 12.58 J kg^–1 K^–1), which can be attributed to the large magnetic density of Dy^III

General One-Step Self-Assembly of Isostructural Intermetallic Co^II₃Ln^III Cubane Aggregates

A new family of Co/rare-earth intermetallic cubane aggregates [Co₃Ln­(hmp)₄(OAc)₅H₂O] (Ln = Dy, Ho, Er, Tm, Yb, Y) have been synthesized by self-assembly. Single-crystal X-ray diffraction analysis revealed that they are remarkably isostructural in showing a common [Co₃Ln] core. Magnetic studies showed that the Dy, Er, Tm, Yb, and Y complexes are ferromagnetic. The Dy complex exhibits the largest magnetocaloric effect (−Δ<i>S</i>_m = 12.58 J kg^–1 K^–1), which can be attributed to the large magnetic density of Dy^III